Installation went smooth to the new packages and new keyboard configuration works fine except for the key "ç" in the Spanish (key code 199) keyboard is considered the same as Up by the emulator.

I remember we had some similar issues in Gngeo-gui.
In my case, this key always returns value 273 (in Spanish and my native settings (where it is the up key)). So that seems consistent. But you get 199 returned as code? Or is it cps2emu that does not handle it in the correct way?